Resonance-suppressed optical fiber acceleration sensing probe and optical fiber micro-seismic monitoring sensor

Abstract

The invention discloses a resonance-suppressed optical fiber acceleration sensing probe and an optical fiber micro-seismic monitoring sensor. The probe comprises a probe shell, a double-end stud, a high-damping elastic body, a mass block, an optical fiber interferometer, a high-damping shock absorption body and a nut, wherein the probe shell is provided with a screw hole at the bottom and an optical fiber access port at the side edge; the double-end stud is arranged in the probe shell, and one end is connected with the threaded hole; the double-end stud is sleeved with the high-damping elasticbody; the mass block is arranged on the double-end stud in a sleeving mode and located on the high-damping elastic body; the optical fiber interferometer is arranged in the mass block and comprises asensing arm and a reference arm, the high-damping elastic body is wound by the sensing arm, and the mass block is wound by the reference arm; the high-damping shock absorption body is located on themass block; the nut is arranged at the other end of the double-end stud and located on the high-damping shock absorption body, and a gasket is arranged between the nut and the high-damping shock absorption body. The probe has the advantages of high sensitivity, electromagnetic interference resistance, high temperature resistance, high pressure resistance and the like, and is suitable for various micro-seismic monitoring scenes.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, resonance suppression and microseismic monitoring, and in particular relates to a resonance suppressed fiber optic acceleration sensing probe and an optical fiber microseismic monitoring sensor. Background technique [0002] Microseismic signals are generated due to rock fractures, involving the whole process of crack initiation, propagation, and penetration from micro-scale to large-scale cracks, and have important characteristics such as large magnitude range and wide vibration frequency. Since the 1960s, microseismic monitoring technology has developed rapidly. The electrical acceleration sensing probe and its microseismic monitoring sensor are used in mining earthquakes, early warning of rock bursts in deep tunnels, slope safety monitoring, early warning of coal and gas outbursts, and water inrush. Fields such as forecasting and oil and gas exploration have gradually been applie...

AI Technical Summary

Problems solved by technology

[0004] At present, fiber optic acceleration sensing probes mostly use silicon oil injection to achieve resonance suppression, but the sealing requirements are high, the structure is complex, the sensitivity is still not high enough, and the working bandwidth is also narrow.

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